<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>
        {% block title %}
        {% endblock %}
    </title>
<!-- 最新版本的 Bootstrap 核心 CSS 文件 -->
<link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">

<!-- 可选的 Bootstrap 主题文件（一般不用引入） -->
<link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap-theme.min.css" integrity="sha384-rHyoN1iRsVXV4nD0JutlnGaslCJuC7uwjduW9SVrLvRYooPp2bWYgmgJQIXwl/Sp" crossorigin="anonymous">

<!-- 最新的 Bootstrap 核心 JavaScript 文件 -->
<script src="https://cdn.bootcss.com/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" crossorigin="anonymous"></script>
</head>
<body>
    <div class="container-fluid">
        {% include 'header.html' %}
        <div class="panel-default">
            <div class="panel-heading">
              {% block headmessage %}{% endblock %}
            </div>
            <div class="panel-body">
               {% block content %}{% endblock %}

            </div>

            <div class="panel-footer">
                {% include 'footer.html' %}
            </div>

        </div>
    </div>


</body>
</html>